Class Acme.RefInt

java.lang.Object
|
+----Acme.RefInt

public class RefInt

extends Object

RefInt - a reference to an int

Used to pass ints to methods by reference, so they can be modified.
You can't use the standard Integer/Long/Float/Double classes for this,
because they are immutable - the number they represent can't be changed
once the object is created. With these Ref classes, on the other hand,
you can change the value all you want